diff --git a/com/raugfer/crypto/coins.java b/com/raugfer/crypto/coins.java
index b386b0a..30bf584 100644
--- a/com/raugfer/crypto/coins.java
+++ b/com/raugfer/crypto/coins.java
@@ -639,7 +639,7 @@ public class coins {
         dict attrs = new dict();
         attrs.put("overloads", "ethereum");
         attrs.put("transfer.gaslimit", 150000);
-        attrs.put("contract.address", (_testnetfun) (testnet -> testnet ? "0x5a89997f38429b5866809dc40a6d677c521ebab9" : "0x89d24a6b4ccb1b6faa2625fe562bdd9a23260359"));
+        attrs.put("contract.address", (_testnetfun) (testnet -> testnet ? "0x1f1cb7a560db6e7cbdff2e6ec4544834acf2cfde" : "0x6b175474e89094c44da98b954eedeac495271d0f"));
         coins.put("dai", attrs);
     }
 
@@ -675,6 +675,14 @@ public class coins {
         coins.put("omisego", attrs);
     }
 
+    static {
+        dict attrs = new dict();
+        attrs.put("overloads", "ethereum");
+        attrs.put("transfer.gaslimit", 150000);
+        attrs.put("contract.address", (_testnetfun) (testnet -> testnet ? "0x5a89997f38429b5866809dc40a6d677c521ebab9" : "0x89d24a6b4ccb1b6faa2625fe562bdd9a23260359"));
+        coins.put("sai", attrs);
+    }
+
     static {
         dict attrs = new dict();
         attrs.put("overloads", "ethereum");
diff --git a/com/raugfer/crypto/nist256p1.java b/com/raugfer/crypto/nist256p1.java
index 12f52a4..abb1032 100644
--- a/com/raugfer/crypto/nist256p1.java
+++ b/com/raugfer/crypto/nist256p1.java
@@ -120,7 +120,7 @@ public static boolean ver(BigInteger[] P, BigInteger h, Object[] S) {
         BigInteger s = (BigInteger) S[1];
         if (!rng(r)) throw new IllegalArgumentException("Out of range");
         if (!rng(s)) throw new IllegalArgumentException("Out of range");
-        if (s.compareTo(n.shiftRight(2)) > 0) throw new IllegalArgumentException("Out of range");
+        if (s.compareTo(n.shiftRight(1)) > 0) throw new IllegalArgumentException("Out of range");
         BigInteger w = s.modPow(n.subtract(BigInteger.valueOf(2)), n);
         BigInteger u = h.multiply(w).mod(n), v = r.multiply(w).mod(n);
         BigInteger[] Q = add(mul(G, u), mul(P, v));
diff --git a/com/raugfer/crypto/secp256k1.java b/com/raugfer/crypto/secp256k1.java
index bcb0fba..a3f9be1 100644
--- a/com/raugfer/crypto/secp256k1.java
+++ b/com/raugfer/crypto/secp256k1.java
@@ -120,7 +120,7 @@ public static boolean ver(BigInteger[] P, BigInteger h, Object[] S) {
         BigInteger s = (BigInteger) S[1];
         if (!rng(r)) throw new IllegalArgumentException("Out of range");
         if (!rng(s)) throw new IllegalArgumentException("Out of range");
-        if (s.compareTo(n.shiftRight(2)) > 0) throw new IllegalArgumentException("Out of range");
+        if (s.compareTo(n.shiftRight(1)) > 0) throw new IllegalArgumentException("Out of range");
         BigInteger w = s.modPow(n.subtract(BigInteger.valueOf(2)), n);
         BigInteger u = h.multiply(w).mod(n), v = r.multiply(w).mod(n);
         BigInteger[] Q = add(mul(G, u), mul(P, v));
diff --git a/com/raugfer/crypto/transaction.java b/com/raugfer/crypto/transaction.java
index d0a22c0..bcf3d7b 100644
--- a/com/raugfer/crypto/transaction.java
+++ b/com/raugfer/crypto/transaction.java
@@ -265,19 +265,6 @@ private static pair<Object, byte[]> parse_rlp(byte[] b) {
         throw new IllegalArgumentException("Unknown type");
     }
 
-    private static byte[] trim_leading_zeroes(byte[] bytes) {
-        int offset = 0;
-        for (; offset < bytes.length - 1; offset++) {
-            if (bytes[offset] != (byte) 0) {
-                break;
-            }
-        }
-        int newLength = bytes.length - offset;
-        byte[] copy = new byte[newLength];
-        System.arraycopy(bytes, offset, copy, 0, newLength);
-        return copy;
-    }
-
     private static final String[][] RIPPLE_FIELDS = {
         {"1", "2", "TransactionType"},
         {"2", "2", "Flags"},
@@ -741,9 +728,9 @@ public static byte[] transaction_encode(dict fields, String coin, boolean testne
             l[4] = nlzint(value);
             l[5] = data;
             if (signed) {
-                l[6] = v;
-                l[7] = trim_leading_zeroes(r);
-                l[8] = trim_leading_zeroes(s);
+                l[6] = nlzint(binint.b2n(v));
+                l[7] = nlzint(binint.b2n(r));
+                l[8] = nlzint(binint.b2n(s));
             }
             return rlp(l);
         }
@@ -1380,9 +1367,9 @@ public static dict transaction_decode(byte[] txn, String coin, boolean testnet)
             fields.put("value", parse_nlzint((byte[]) l[4]).l);
             fields.put("data", l[5]);
             if (l.length > 6) {
-                fields.put("v", l[6]);
-                fields.put("r", l[7]);
-                fields.put("s", l[8]);
+                fields.put("v", binint.n2b(parse_nlzint((byte[]) l[6]).l, 1));
+                fields.put("r", binint.n2b(parse_nlzint((byte[]) l[7]).l, 32));
+                fields.put("s", binint.n2b(parse_nlzint((byte[]) l[8]).l, 32));
             }
             return fields;
         }